Johnson was shot and killed in the 3700 block of Saint Claude Avenue at about 10 p.m. Thursday.

In surveillance video obtained by detectives, an unknown black man wearing a plaid ?Russian Ushanka?-style hat with a black leather jacket and possibly a purple-colored shirt under the jacket is seen entering the store where the shooting happened. The unknown black woman was seen wearing a white zip-up hooded sweatshirt with black letters. She is described as having a ponytail hairstyle, with bangs.

Police said both subjects were seen entering the store, but they did not purchase anything.

As the man exited the store, a design can be seen on his rear pockets, police said. A short time thereafter, the victim is shot and killed.

The woman remained in the store while the shooting occurs, and is seen fleeing the store.

Anyone with information regarding the identity of these subjects is asked to contact Crimestoppers at 504-822-1111 or the New Orleans Police Department?s Homicide Division at 504-658-5300.

The death comes after a bloody day in the Crescent City, where 3 people were killed in New Orleans East. Police shot and killed the suspect in that incident.

The Obama administration will unveil a major climate change plan Monday aimed at a large reduction in greenhouse gas emissions from the nation's coal-burning power plants, a senior administration official told CNN.